NiMgAl三元类水滑石的制备研究

The synthesis principal of NiMgAl hydrotalcite-like compounds by co-precipitation was studied in the system of Ni(NO3) 2-Mg(NO3) 2-Al(NO3) 3-NaOH. The effect of pH Ni/Mg ratios, co-preciptation temperature, time and temperature of hydrothermal treatment on the synthesis of NiMgAl-HTLCs were also investigated. The synthesized samples were characterized by using XRD, ICP, and FT-IR. Experimental results showed that unique NiMgAl-HTLcs with high crystallinity can be prepared by precipitation of solutions with M2+/M3+=2.0 and Ni/Mg=2.0～4.0 at pH=5.5～7.0, 100 ℃，7 h hydrothermal treatment. Study on the thermal stability of NiMgAl-HTLcs showed that the structure started to be destroyed at 3 00 ℃.